Marcus Aurelius Antoninus (Latin: [máːɾkus̠ auɾέːli.us̠ antɔ́ːni.us̠]; English: aw-REE-lee-əs; 26 April 121 – 17 March 180) was Roman emperor from 161 to 180 AD and a Stoic philosopher. He was the last of the rulers known as the Five Good Emperors (a term coined some 13 centuries later by Niccolò Machiavelli), and the last emperor of the Pax Romana, an age of relative peace and stability for the Roman Empire lasting from 27 BC to 180 AD. He served as Roman consul in 140, 145, and 161. Marcus Aurelius was born during the reign of Hadrian to the emperor's nephew, the praetor Marcus Annius Verus, and the heiress Domitia Calvilla. His father died when he was three, and his mother and grandfather raised him. After Hadrian's adoptive son, Aelius Caesar, died in 138, the emperor adopted Marcus's uncle Antoninus Pius as his new heir. In turn, Antoninus adopted Marcus and Lucius, the son of Aelius. Hadrian...